anancasm

an·an·casm

(an'an-kazm),
Any form of repetitious stereotyped behavior that, if prevented, results in anxiety.
[G. anankasma, compulsion]
Farlex Partner Medical Dictionary © Farlex 2012

anancasm

An obsolete term for ritualistic act or sequence of acts performed by a person with obsessive-compulsive neurosis.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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Repetition and accumulation are the rhizomes of his work: "There's no telling how much green / is buried under this green / nor how much rain under this rain / many are the infinities ..." For Zanzotto--like Ammons, probably his closest American counterpart--life is an "anancasm" of seeing and ideating, which the poet breaks down to its constituent elements.
The other two modes are evolution by chance (tychasm) and evolution by mechanical necessity (anancasm).